American Dryer Corp. ML-410 - Manual (Page 35)

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C. EXHAUST REQUIREMENTS
NOTE: For 1 Door ML-410 dryer models, the 28-inch (71.12 cm) diameter exhaust duct exits
from the rear of the base. For 2 Door ML-410 dryer models, the 28-inch (71.12 cm)
diameter exhaust duct exits from the left side of the base.
NOTE: For 1 Door/2-Way Tilt ML-410 dryer models, keep the exhaust ducting at least 36-inches
(91.44 cm) away from the back of the dryer so that the dryer WILL NOT hit the ducting
when the dryer tilts to the rear.
1. General Exhaust Duct Work Information
Exhaust duct work should be designed and installed by a qualified professional. Improperly sized duct
work will create excessive back pressure which results in slow drying, increased use of energy, overheating
of the dryer, and shutdown of the burner by the airflow (sail) switches, burner hi-limits, or tumbler (basket)
hi-heat thermostats.
CAUTION: DRYER MUST BE EXHAUSTED TO THE OUTDOORS.
CAUTION: IMPROPERLY SIZED or INSTALLED EXHAUST DUCT WORK CAN
CREATE A POTENTIAL FIRE HAZARD.
NOTE: When a dryer is exhausted separately, it is recommended that a back draft damper be
installed.
NOTE: When dryers are exhausted into a multiple (common) exhaust line, each dryer must be
supplied with a back draft damper.
The duct work should be laid out in such a way that the duct work travels as directly as possible to the
outdoors with as few turns as possible. Single or independent dryer venting is recommended.
The shape of the duct work is not critical so long as the minimum cross-sectional area is provided. It is
suggested that the use of 90º turns in ducting be avoided; use 30º and/or 45º angles instead. The radius of the
elbow should preferably be 1-1/2 times the diameter of the duct.
The dryer comes with a 28-inch (71.12 cm) diameter exhaust duct connection. The plant’s exhaust duct
must be at least 28-inches (71 cm) in diameter or for a rectangular duct have a cross-sectional area of 616
square inches (3,959 sq.cm.). The duct work from the dryer to the outside exhaust outlet should not exceed
30 feet (9.14 meters). The shape of the duct work is not critical so long as the minimum cross-sectional area
is provided. It is suggested that the use of 90º turns be avoided; use 45º angles instead. The radius of the
elbows should preferably be 1-1/2 times the width or diameter of the duct. Excluding tumbler (basket)/dryer
elbow connections or elbows used for outside protection from the weather, no more than two (2) elbows
should be used in the exhaust duct run. If more than two (2) elbows are used, the cross-sectional area of the
duct work must be increased.
ALL duct work should be smooth inside with no projections from sheet metal screws or other obstructions
which will collect lint. When adding ducts, the duct to be added should overlap the duct to which it is to be
connected. ALL duct work joints must be taped to prevent moisture and lint from escaping into the building.
Inspection doors should be installed at strategic points in the exhaust duct work for periodic inspection and
clean-out of lint from the duct work.